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Review of Safety for Pressure-Relieving Systems of Small to Middle Scale Chemical Plants
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 Title & Authors
Review of Safety for Pressure-Relieving Systems of Small to Middle Scale Chemical Plants
Yim, Ji-Pyo; Jin, Dae-Young; Ma, Byung-Chol; Kang, Sung-Ju; Chung, Chang-Bock;
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 Abstract
A variety of safety issues were investigated for chemical reactors using a toluene solvent in case of a fire at small to middle scale chemical plants. The issues covered the operation of pressure-relieving valves and the subsequent discharges of the toluene to the atmosphere either directly or through an absorber, which represent the current practice at most small chemical plants. It was shown that the safety valve on the reactor may not operate within about twenty minutes after an external fire breaks out, but, once relieved, the toluene vapor released directly to the atmosphere may form a large explosion range on the ground. It was also shown that if the discharge is routed to an existing absorber used for the scrubbing of volatile organic compounds or dusts, the column may not operate normally due to excessive pressure drops or flooding, resulting in the hazardous release of toluene vapors. This study proposed two ways of alleviating these risks. The first is to ruduce the discharge itself from the safety valve by using adequate insulation and protection covers on the reactor and then introduce it into the circulation water at the bottom of the absorber through a dip linet pipe equipped with a ring-shaped sparger. This will enhance the condensation of toluene vapors with the reduced effluent vapors treated in the packing layers above. The second is to install a separate quench drum to condense the routed toluene vapors more effectively than the existing absorber.
 Keywords
pressure-relieving system;pressure safety valve;absorber;quench drum;
 Language
Korean
 Cited by
 References
1.
S. W. Lee, J. R. Lee and Y. J. Huh, "A Study on Estimation of Structure Damage Caused by VCE", Journal of the Korea Society of Safety, Vol. 22, No. 5, pp. 65-70, 2007.

2.
Korea Occupational Safety & Health Agency, "Major Industrious Accident Investigation Report-vapor Cloud Fire and Explosion Accident", pp. 1-19, 2011.

3.
API Standard 521, "Pressure-relieving and Depressuring System", pp. 36-54, 2014.

4.
KOSHA Guide D-18, "The Technical Guideline for Design and Installation of Safety Valve", KOSHA, pp. 7-10. 2012.

5.
J. P. Yim, B. C. Ma and C. B. Chung, "A Study on the Safety of Small LPG Storage Tanks at External Fires", Journal of the Korea Society of Safety, Vol. 30, No. 4, pp. 64-72, 2015. crossref(new window)

6.
K. D. Lee and C. S. Shin, "A Study on the Damaging Distance and the Explosion Effect by the LPG Release", Journal of the Korea Society of Safety, Vol. 14, No. 2, pp. 109-115, 1999.

7.
KOSHA Guide D-107, "The Guideline for Selection of the Worst Release Scenario", KOSHA, pp. 2-4. 2012.

8.
Daegu Regional Environmental Office, "Air Pollution Control Technology Design Working Reference", pp. 134-158, 1999.

9.
W. L. McCabe, J. C. Smith and P. Harriott, "Unit Operation", McGraw Hill, pp. 535-570, 1991.